Recombinant human endostatin(Endostar) is commonly used through intermittent intravenous adminstration in routine clinical practice in China. It is very difficult to maintain steady-state of plasma concentration of this agent due to this manner of application. Continous infusional Endostar was designed to alter the imblance of concentration to avoid compromising efficacy of anti-angionesis therapy.The strategy of dose-escalation was used in this study in order to obtain the optimal dosage of Endostar for the next phase Ⅱ trial.